I think it's advantageous for them to put suggested Cosplay Hall gatherings in the schedule because Aki-Con is so small that not many people use the forums and not every fandom is going to have a super motivated organizer to try and run a gathering. And if they did, who would go around organizing all the scheduled photoshoots? Aki-Con is more about spontaneity and having fun hanging out with friends in cosplay than having a ton of flawless programming.

I think it would be good if they clarified their "these are just suggested times for gatherings" stance more publicly, though.